Ligger IPE 450 naar kolom HEB 340

Type verbinding: Enkelzijdige consoleverbinding

Eenheden : metrisch

Ontworpen vlgs.: EN 1993-1-8 en EN 1998-1

Onderzocht: platen, bouten

Staal: klasse S355

Bouten: M30 klasse 10.9

Het voorbeeld is ontleend aan R. Landolfo et al. Ontwerp van staalconstructies voor gebouwen in seismische gebieden, ECCS Eurocode Design Manual. Willy, 2017.

Geometrie

Beam IPE 450 is connected to column HEB 340 via haunched end plate joint. The haunch is under 35° with the web and flange thicknesses of 9.4 mm and 18 mm, respectively. The height of the haunch is 178 mm and the length is 250 mm. The column is stiffened by continuous plates with the thickness of 15 mm and by web doublers from both sides with the thickness of 10 mm each. The height of the doublers is the same as the height of the end plate. The end plate has the thickness of 35 mm.

Ligger IPE 450 is verbonden met kolom HEB 340 via kopplaat met console. De console is minder dan 35° met een lijf- en flensdikte van respectievelijk 9,4 mm en 18 mm. De hoogte van de console is 178 mm en de lengte is 250 mm. De kolom wordt versterkt door verstijvers met een dikte van 15 mm en door lijfopdikplaten aan beide zijden van het kolomlijf met een dikte van elk 10 mm. De hoogte van de opdikplaten is gelijk aan de hoogte van de kopplaat. De kopplaat heeft een dikte van 35 mm.

Toegepaste belasting

The joint is loaded by the probable bending moment at the formation of plastic hinge in the beam M_Ed = γ_sh ⋅ f_y,ov ⋅ W_pl and corresponding shear load V_Ed = 2 ⋅ M_Ed / L_h, where:

• γ_sh = 1.2 – strain-hardening factor
• f_y,ov = γ_ov ⋅ f_yk = 1.25 ⋅ 355 = 443.75 MPa – probable yield strength of the beam
• γ_ov = 1.25 – overstrength factor
• f_yk = 355 MPa – characteristic yield strength

The position of the load in the beam is set to the expected position of plastic hinge.

De verbinding wordt belast door het buigmoment bij de vorming van een plastisch scharnier in de ligger M_Ed = γ_sh ⋅ f_y,ov ⋅ W_pl  en bijbehorende dwarskrachtbelasting V_Ed = 2 ⋅ M_Ed / L_h, waarbij:

• γ_sh= 1,2 – rekverhardingsfactor
• f_y,ov = γ_ov ⋅ f_yk = 1,25 ⋅ 355 = 443,75 MPa – waarschijnlijke vloeigrens van de balk
• γ_ov= 1,25 – oversterktefactor
• f_yk= 355 MPa – karakteristieke vloeigrens

De positie van de last in de ligger wordt ingesteld op de verwachte positie van het plastische scharnier.

Handberekening

De componenten van de verbinding worden belast door een buigend moment aan het kolomvlak, d.w.z. M_j,Ed = 981,5 kNm.

De plastische buigweerstand van de verlopende doorsnede: 955.6 kNm – Niet gelukt

Kolom lijf op afschuiving: Belast door afschuifkracht V_wp,Ed = 1581,2 kN, componentweerstand  V_wp,Rd = 1631,5 kN – OK

T-stubs van de kopplaat voor 'hogging' buigend moment (slechts 3 verste boutrijen worden in aanmerking genomen): M_T,Rd = 1018,8 kNm – OK

T-stubs van de kopplaat voor 'sagging' buigmoment (er wordt rekening gehouden met slechts 3 verste boutrijen): M_T,Rd = 1080,6 kNm – OK

T-stubs van de kolomflens voor 'hogging' buigend moment (er wordt rekening gehouden met slechts 3 verste boutrijen): M_T,Rd = 876,1 kNm – Niet gelukt

T-stubs van de kolomflens voor 'sagging' buigmoment (er wordt rekening gehouden met slechts 3 verste boutrijen): M_T,Rd = 929,2 kNm – NOK

De verbindingsweerstand voor het buigend moment is Mj,Rd = 876,1 kNm en voor het buigend moment 'sagging' is M_j,Rd  = 929,2 kNm.

Moment op het kolomvlak zonder de oversterkte- en rekverhardingsfactoren voor de ligger: M_Ed = 654,3 kNm, corresponderende schuifkracht V_Ed = 196,5 kNm. Alle componentcontroles slagen voor deze belasting.

De macrocomponenten kunnen worden ingedeeld:

• kolom lijf – sterk
• verbinding – gebalanceerde knoopkrachten

Resultaten met IDEA StatiCa

Alle componenten en spanningscontroles op niet-dissipatieve platen zijn OK en dus kunnen de macrocomponenten worden geclassificeerd als:

• kolom webpaneel: sterk
• verbinding: sterk

Om de maximale belastingsweerstand in IDEA Connection te bepalen, werd de rekverharding iteratief verhoogd naast de toegepaste belasting totdat de controles faalden. De belastingsweerstand van deze verbinding is 1 016 kNm aan het kolomvlak en de bijbehorende dwarskracht 305 kN.

Vergelijking

De handmatige berekening volgens de Component-methode (EN 1993-1-8) bepaalt de buigweerstand van de verbinding op M_j,Rd  = 876,1 kNm met de aannames van de rotatie-as op het midden van de consolehoogte en slechts drie verste rijen die bijdragen aan de buigweerstand. De verbinding is dus gebalanceerd.

IDEA Connection gebruikt de op componenten gebaseerde eindige-elementenmethode en bepaalt de buigweerstand aan het kolomoppervlak M_j,Rd = 1 016 kNm. Het verschil is 15% ten opzichte van de handmatige berekening. De verbinding volgens de CBFEM-methode is sterk.

Lassen

De lassen worden niet gecontroleerd omdat de detaillering van lassen is voorgeschreven volgens Equaljoints (R. Landolfo et al. European pre-QUALified steel JOINTS – EQUALJOINTS, Final report, 2016). In het IDEA project zijn alle lassen ingesteld als stompe lassen.

Beam IPE 360 to column HEB 280

Type of connection: Single sided haunched joint

Unit system: Metric

Designed acc. to: EN 1993-1-8 and EN 1998-1

Investigated: Plates, bolts

Steel: Grade S355

Bolts: M27 Grade 10.9

The example is taken from EQUALJOINTS example No. 264: https://itunes.apple.com/us/app/equal-joints/id1406825195?mt=8

Geometry

Beam IPE 360 is connected to column HEB 280 via haunched end plate joint. The haunch is under 45° with the web and flange thicknesses of 8 mm and 12.7 mm, respectively. The height and length of the haunch are 200 mm. The column is stiffened by continuous plates with the thickness of 12 mm and by web doublers from both sides with the thickness of 10 mm each. The height of the doublers is the same as the height of the end plate. The end plate has the thickness of 25 mm.

Applied load

The joint is loaded by the probable bending moment at the formation of plastic hinge in the beam M_Ed = γ_sh ⋅ f_y,ov ⋅ W_pl and corresponding shear load V_Ed = 2 ⋅ M_Ed / L_h, where:

• γ_sh = 1.2 – strain-hardening factor
• f_y,ov = γ_ov ⋅ f_yk = 1.25 ⋅ 355 = 443.75 MPa – probable yield strength of the beam
• γ_ov = 1.25 – overstrength factor
• f_yk = 355 MPa – characteristic yield strength

The position of the load in the beam is set to the expected position of plastic hinge.

Manual calculation

The components of the connection are loaded by a bending moment at the column face, i.e. M_j,Ed = 572.8 kNm.

The plastic bending resistance of the haunched cross-section: 582.3 kNm – OK

Column web panel in shear: Loaded by shear force V_wp,Ed = 1 034.6 kN, component resistance V_wp,Rd = 1 202.8 kN – OK

T-stubs of the end plate for hogging bending moment (only 3 furthest bolt rows are taken into account): M_T,Rd = 573.0 kNm – OK

T-stubs of the end plate for sagging bending moment (only 3 furthest bolt rows are taken into account): M_T,Rd = 697.5 kNm – OK

T-stubs of the column flange for hogging bending moment (only 3 furthest bolt rows are taken into account): M_T,Rd = 545.4 kNm – Failed

T-stubs of the column flange for sagging bending moment (only 3 furthest bolt rows are taken into account): M_T,Rd = 579.5 kNm – Failed

The connection resistance for hogging bending moment is M_j,Rd = 545.4 kNm and for sagging bending moment is M_j,Rd = 579.5 kNm.

Moment at the column face without the overstrength and strain-hardening factors for the beam: M_Ed = 381.9 kNm, corresponding shear force V_Ed = 98.9 kNm. All component checks pass for this load.

The macrocomponents can be classified:

• column web panel – strong
• connection – balanced

Results of IDEA StatiCa

All the components and strain checks on non-dissipative plates pass and thus the macrocomponents can be classified as:

• column web panel: strong
• connection: strong

To determine the maximum load resistance in IDEA Connection, the strain-hardening was iteratively increased alongside with the applied load until the checks failed. The load resistance of this connection is 657.4 kNm at the column face and the corresponding shear force 170.3 kN.

Comparison

The manual calculation according to Component method (EN 1993-1-8) determines the bending resistance of the connection M_j,Rd = 545.4 kNm with the assumptions of axis of rotation at the middle of the haunch height and only three furthest rows contributing to the bending resistance. The connection is therefore balanced.

IDEA Connection uses Component based finite element method and determines the bending resistance at the column face M_j,Rd = 657.4 kNm. The difference is 20 % compared to the manual calculation. Increasing the mesh density slightly reduces the joint resistance. With dense mesh – 24 elements on member's web, the utilization of bolts is 99 % and plastic strain on end plate is 4.1 % at the set load. Therefore, M_j,Ed = 572.8 kNm at column face is very close to the limit resistance. This resistance is 15 % lower than with default mesh density and 5 % higher than according to manual calculation. It is recommended to increase mesh density for long end plates. The connection according to CBFEM method is strong.

Beam IPE 600 to column HEB 500

Type of connection: Single sided haunched joint

Unit system: Metric

Designed acc. to: EN 1993-1-8 and EN 1998-1

Investigated: Plates, bolts

Steel: Grade S355

Bolts: M36 Grade 10.9

The example is taken from EQUALJOINTS example No. 267: https://itunes.apple.com/us/app/equal-joints/id1406825195?mt=8

Geometry

Beam IPE 600 is connected to column HEB 500 via haunched end plate joint. The haunch is under 35° with the web and flange thicknesses of 12 mm and 19 mm, respectively. The height and length of the haunch are 270 mm and 386 mm, respectively. The column is stiffened by continuous plates with the thickness of 20 mm and by web doublers from both sides with the thickness of 15 mm each. The height of the doublers is the same as the height of the end plate. The end plate has the thickness of 35 mm.

Applied load

The joint is loaded by the probable bending moment at the formation of plastic hinge in the beam M_Ed = γ_sh ⋅ f_y,ov ⋅ W_pl and corresponding shear load V_Ed = 2 ⋅ M_Ed / L_h, where:

• γ_sh = 1.2 – strain-hardening factor
• f_y,ov = γ_ov ⋅ f_yk = 1.25 ⋅ 355 = 443.75 MPa – probable yield strength of the beam
• γ_ov = 1.25 – overstrength factor
• f_yk = 355 MPa – characteristic yield strength

The position of the load in the beam is set to the expected position of plastic hinge.

Manual calculation

The components of the connection are loaded by a bending moment at the column face, i.e. M_j,Ed = 2 105.4 kNm.

The plastic bending resistance of the haunched cross-section: 1 903.3 kNm – Failed

Column web panel in shear: Loaded by shear force V_wp,Ed = 2 446.8 kN, component resistance V_wp,Rd = 2 773.7kN – OK

T-stubs of the end plate for hogging bending moment (only 4 furthest bolt rows are taken into account): M_T,Rd = 1 998.9 kNm – Failed

T-stubs of the end plate for sagging bending moment (only 4 furthest bolt rows are taken into account): M_T,Rd = 2 317.7 kNm – OK

T-stubs of the column flange for hogging bending moment (only 4 furthest bolt rows are taken into account): M_T,Rd = 2 015.1 kNm – Failed

T-stubs of the column flange for sagging bending moment (only 4 furthest bolt rows are taken into account): M_T,Rd = 2 106.5 kNm – OK

The connection resistance for hogging bending moment is M_j,Rd = 1 903.3 kNm and for sagging bending moment is M_j,Rd = 1 903.3 kNm. The bending resistance of the haunched cross-section is decisive. The overstrength factor is used for the whole beam and thus, the increased yield strength could be used for the haunched cross-section as well and the bending resistance would be higher. Next weakest components are T-stubs of end plate and column flange. The connection resistance for hogging and sagging bending moment would be M_j,Rd = 1 998.9 kNm M_j,Rd = 2 106.5 kNm, respectively. With this assumption, the connection would be full strength for γ_sh = 1.1 as suggested by EN 1998-1.

Moment at the column face without the overstrength and strain-hardening factors for the beam: M_Ed = 1 403.6 kNm, corresponding shear force V_Ed = 374.3 kNm. All component checks pass for this load.

The macrocomponents can be classified:

• column web panel – strong
• connection – balanced

Results of IDEA StatiCa

The deformed shape with deformation scale 5 is shown and the plastic hinge is clearly visible. The bolts are just slightly over 100 % utilization and the maximum plastic strain of most stressed plates are 1.4, 1.1, and 1.1 for the flange of the widener, the end plate, and the column flange, respectively. The resistance is expected very slightly below the set loads. The macrocomponents can be classified as:

• column web panel: strong
• connection: balanced

Comparison

The manual calculation according to Component method (EN 1993-1-8) determines the bending resistance of the connection M_j,Rd = 1 903.3 kNm with the assumptions of axis of rotation at the middle of the haunch height and only three furthest rows contributing to the bending resistance. The connection is therefore balanced. Considering the increase in the yield strength of the beam at the end plate face, the resistance of the governing component would be higher. Next governing component is the end plate with M_j,Rd = 1 998.9 kNm.

IDEA Connection uses Component based finite element method and determines the bending resistance at the column face M_j,Rd = 2 100 kNm. The difference is 5 % compared to the manual calculation. Increasing the mesh density slightly reduces the joint resistance. With dense mesh – 16 elements on member's web, the resistance drops by only 2 %. The connection according to CBFEM is balanced.